re: #121 Eclectic Cyborg:

(snip fantasy of a “good man with a gun” taking on Paddock)

Well, that’s pretty close to what actually happened here:

When a security guard approached Paddock’s room, the gunman fired through the door and struck him in the leg, police said.

A “strike team” of police assembled to breach the door.

latimes.com

So yeah, your good men with guns would have been completely overwhelmed.